JP3741678B2 - Brushless fan motor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a brushless fan motor having a stator side waterproofed by a silicone rubber mold.
[0002]
[Prior art]
A normal brushless fan motor includes a stator, a circuit board including a control circuit for controlling a current flowing through each winding of the stator, and a plurality of rotor magnetic poles made of permanent magnets on the inner peripheral side. A rotor having a plurality of blades on the outer peripheral side, a bearing support cylinder portion that houses a bearing that rotatably supports the rotation shaft of the rotor, a housing portion that surrounds the outer periphery of the blade, and a circuit board are accommodated. And a stator side case having a plurality of webs for connecting the substrate storage part and the housing part, and one web is provided with a plurality of lead wires extending from the control circuit of the circuit board. It has a structure in which a lead wire storage groove that is stored and guided to the housing side is formed.
[0003]
Such a brushless fan motor is sometimes installed in an outdoor hut ventilation port to cool an internal power supply or electronic device. In brushless fan motors used for such applications, if rain entering from the ventilation opening of a hut enters the stator side case, a short circuit may occur in the control circuit, or a failure that causes rust in the bearing will occur. In the worst case, however, the motor stops rotating and the power supply and the electronic device cannot be cooled.
[0004]
To avoid this, most of the stator in the case on the stator side is molded with silicone rubber, and then the lead wire receiving groove in the web containing the lead wire is filled with silicone rubber to lead the lead. A brushless fan motor has been proposed in which wire molding is performed and the stator side is waterproofed.
[0005]
[Problems to be solved by the invention]
However, in the conventional waterproof brushless fan motor having such a structure, the second lead wire molding is performed manually, which causes a problem that the manufacturing cost is increased. Further, in the structure as described above, there is a problem that water may enter if there is an interface at two mold parts and peeling occurs at that part. Furthermore, in the structure as described above, the magnetic pole surface of the stator is exposed and molded, and the magnetic pole surface is covered later with another material, which also increases the number of work steps. Moreover, when the magnetic pole surface is covered with another material, there is still a problem that an interface is formed and water easily enters the inside.
[0006]
An object of the present invention is to provide a brushless fan motor having high waterproofness.
[0007]
Another object of the present invention is to provide a brushless fan motor that can perform molding without forming an interface in the mold layer.
[0008]
Another object of the present invention is to provide a brushless fan motor having a high waterproof effect.
[0009]
Another object of the present invention is to provide a brushless fan motor capable of preventing water from entering the iron core from the magnetic pole surface.
[0010]
[Means for Solving the Problems]
The present invention provides a stator having a plurality of stator magnetic poles in which a winding is wound around a salient pole portion of an iron core having a plurality of salient pole portions, and a plurality of stators fixed to the stator. A circuit board on which an electronic component constituting a control circuit for controlling a current flowing in a winding constituting the child magnetic pole is mounted, and a plurality of rotor magnetic poles made of permanent magnets are provided on the inner peripheral side and a plurality of outer magnetic poles are provided on the outer peripheral side. A rotor including a blade, a bearing support cylinder portion in which a bearing that rotatably supports the rotation shaft of the rotor is housed, a housing portion that surrounds the outer periphery of the rotor blade, and a circuit board are housed. And a stator-side case including a plurality of webs connecting the substrate storage part and the housing part, and a plurality of webs extending from the control circuit of the circuit board. The lead wire is stored and guided to the housing side A lead wire storage groove is formed, and a communication path is formed between the lead wire storage groove and the substrate storage portion to communicate the both, and is stored in the circuit board and the lead wire storage groove including the stator and electronic components. A brushless fan motor in which a plurality of lead wires are molded with silicone rubber is an object of improvement.
[0011]
In the present invention, the stator, the circuit board including the electronic components, and the plurality of lead wires are integrally molded by one injection of silicone rubber while being accommodated in the stator side case. With such a structure, the molding work with silicone rubber becomes one time, and the number of work steps is reduced. Further, since the silicone rubber mold layer does not have an interface between two mold parts as in the prior art, the waterproof effect is high.
[0012]
In the present invention, it is preferable that the magnetic pole surface of the stator magnetic pole of the stator is also covered with silicone rubber. In this way, water can be prevented from entering the iron core from the magnetic pole surface. In addition, the number of work steps is reduced as compared with the case where the magnetic pole surface is covered with another material in a separate process.
[0013]
Further, in the present invention, the rotor is fixed to the rotating shaft in order to fix the rotor side case to the rotating shaft, and the rotor side case in which the blade is arranged on the outer peripheral side and the rotor magnetic pole is arranged on the inner peripheral side. With a bush, and at the opening side end portion of the rotor side case and the opening side end portion of the substrate storage portion of the stator side case, both are opposed to each other with a slight gap therebetween. It forms a labyrinth structure that prevents intrusion. Further, it is preferable to form a labyrinth structure that prevents the water from entering the inside by facing the end portion of the bearing supporting cylinder portion and the bush with a slight gap therebetween. In this way, a labyrinth structure is formed between the opening side end of the rotor side case and the opening side end of the substrate housing part of the stator side case, and the end of the bearing supporting cylinder and the bush If a labyrinth structure is formed between the two, water can be prevented from entering the stator side.
[0014]
In the manufacturing method of the present invention, the stator, the circuit board including the electronic components, and the plurality of lead wires are housed in the stator side case, and are fitted to the board housing portion and the bearing supporting cylinder portion. The first mold is disposed so as to form a mold space including the electronic component, and the second mold is disposed to close the lead wire housing groove so as to leave an air vent on the housing side. And the attitude | position of the stator side case which has arrange | positioned the 1st and 2nd mold type | mold so that an air vent may be located upwards is defined. Then, silicone rubber is injected into the mold space from a silicone rubber injection port provided in the first mold, and silicone rubber is injected into the lead wire receiving groove through the communication path to manufacture a brushless fan motor.
[0015]
When silicone rubber is injected by positioning the air vent port upward in this way, the silicone rubber enters the lead wire housing groove together with the discharge of air, and can be easily molded by a single injection of rubber. Further, if the injection amount is limited, the rubber does not stick out from the lead wire storage groove, and the post-processing after cutting out the protruding rubber becomes unnecessary.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a first example of an embodiment of a brushless fan motor according to the present invention.
[0017]
In the figure, reference numeral 1 denotes a stator, and the stator 1 is configured by winding a winding 3 around each salient pole portion 2a of an iron core 2 having a plurality of salient pole portions 2a. These salient pole portions 2 a act as stator magnetic poles by exciting the winding 3. Therefore, the tip of the salient pole portion 2a becomes the magnetic pole surface 2a 'of the stator magnetic pole. 4 I Oh the circuit board that is fixed to the stator 1, in the circuit board 4 constituting a control circuit for controlling the current supplied to the winding 3 of the plurality of stator magnetic poles of the stator 1 Electronic components are mounted. The control circuit of the circuit board 4 and the winding 3 are passed through the through hole 4a of the circuit board 4 and soldered by solder 4b and the lead wire 3a of the winding 3 is wound around the terminal pin 4c and soldered. It is connected. A rotor 5 includes a plurality of rotor magnetic poles 6 made of permanent magnets on the inner peripheral side and a plurality of blades 7 on the outer peripheral side. Reference numeral 8 denotes a stator-side case, and a bearing supporting cylinder portion 11 in which a bearing 10 that rotatably supports a rotating shaft 9 of the rotor 5 is housed, and a housing portion that surrounds the outer periphery of the blade 7 of the rotor 5 12, a circuit board housing part 13 in which the circuit board 4 is housed and fixed, and a plurality of webs 14 for connecting the circuit board housing part 13 and the housing part 12 to each other. One of the plurality of webs 14 has a lead wire storage groove 16 that stores a plurality of lead wires 15 that are connected to the control circuit of the circuit board 4 and that guides them toward the housing 12. Is formed. A communication passage 17 is formed between the lead wire storage groove 16 and the substrate storage portion 13 to communicate the both.
[0018]
The rotor 5 includes a rotor-side case 18 in which a blade 7 is disposed on the outer peripheral side and a rotor magnetic pole 6 is disposed on the inner peripheral side, and a rotating shaft 9 for fixing the rotor-side case 8 to the rotating shaft. And a fixed bush 19. In particular, the rotor side case 18 is formed by a flywheel 20 that supports the rotor magnetic pole 6 on the inner periphery and a blade mounting hub 21 that supports the blade 7 on the outer periphery. The flywheel 20 includes a cylindrical yoke portion 20a that supports the rotor magnetic pole 6 on the inner periphery, and a bottom plate portion 20b that is fixed to the bush 19 while receiving one end of the yoke portion 20a. Has been. The yoke portion 20a is fixed to the blade mounting hub 21 with an adhesive 22, and the blade mounting hub 21 is fixed to the bottom plate portion 20b by fixing means (not shown).
[0019]
The opening side end portion 18a of the rotor side case 18 and the opening side end portion 13a of the substrate storage portion 13 of the stator side case 8 are opposed to each other through a slight gap 23 and water enters the inside. It is comprised so that the labyrinth structure which prevents this may be formed. Further, the end portion 11a of the bearing supporting cylinder portion 11 and the bush 19 are configured so as to form a labyrinth structure in which both face each other through a slight gap 24 and prevent water from entering inside. This prevents water from entering the case.
[0020]
The stator 1, the circuit board 4 including electronic components, and the plurality of lead wires 15 are integrally molded by one injection of the silicone rubber 25 while being accommodated in the stator side case 8. In the stator 1, the magnetic pole surface 2 a ′ of the stator magnetic pole is also thinly covered with silicone rubber 25.
[0021]
With such a structure, the molding work with the silicone rubber 25 is performed once, and the number of work steps is reduced. Further, since the mold layer made of the silicone rubber 25 does not have an interface between the two mold parts, the waterproof effect is high. Furthermore, since the magnetic pole surface 2a ′ of the stator magnetic pole of the stator 1 is also covered with the silicone rubber 25, water can be prevented from entering the iron core 2 from the magnetic pole surface 2a ′ of the stator magnetic pole. In addition, the number of work steps is reduced as compared with the case where the magnetic pole surface 2a 'is covered in a separate process.
[0022]
FIG. 2 shows a second example of the embodiment of the brushless fan motor according to the present invention. In this brushless fan motor, the labyrinth structure is not provided between the opening side end portion 18a of the rotor side case 18 and the opening side end portion 13a of the substrate storage portion 13 of the stator side case 8. , Provided only between the end portion 11 a of the bearing supporting cylinder portion 11 and the bush 19. Other configurations are the same as those in the first example. Even in such a structure, the labyrinth structure of the gap 24 can prevent water entering along the rotation shaft 9 from reaching the stator 1 side.
[0023]
3 and 4 are views showing a state when forming a mold portion for waterproofing the stator 1 side in the brushless fan motor having the waterproof structure described above. Waterproofing of the stator 1 side is performed before the rotor 5 is assembled. At this time, the stator 1, the circuit board 4 including the electronic components, and the plurality of lead wires 15 are accommodated in the stator side case 8, and are fitted to the board accommodating portion 13 and the bearing supporting cylinder portion 11. A first mold 27 is disposed so as to form a mold space 26 including the stator 1 and electronic components. In addition, a second mold 29 for closing the lead wire housing groove 16 so as to leave the air vent 28 on the housing 12 side is disposed. In this case, although the lead wire 15 in the lead wire housing groove 16 is housed in the protective tube 15 ', a structure in which the protective tube 15' is not covered may be employed.
[0024]
As shown in FIG. 3, the attitude of the stator side case 8 in which the first and second mold dies 27 and 29 are arranged so that the air vent 28 is positioned above is determined. In this posture, a silicone rubber injection port 30 is provided in advance in the first mold 27 so as to be positioned below the mold space 26. Then, the silicone rubber 25 is injected into the mold space 26 from the silicone rubber injection port 30, and the silicone rubber 25 is injected into the lead wire storage groove 16 through the communication path 17. In this way, the silicone rubber 25 is gradually filled from the lower part of the mold space 26 to the upper part, and finally rises in the lead wire receiving groove 16 through the communication path 17. When the silicone rubber 25 rises to a predetermined position in the lead wire storage groove 16, the injection of the silicone rubber 25 from the silicone rubber inlet 30 is stopped. When the molded silicone rubber 25 is hardened, the first and second mold dies 27 and 29 are removed.
[0025]
When the silicone rubber 25 is injected while the air vent 28 is positioned upward in this manner, the silicone rubber 25 enters the lead wire receiving groove 16 together with the discharge of air, and is easily molded by a single injection of rubber. be able to. Further, if the injection amount is limited, the silicone rubber 25 does not protrude from the lead wire storage groove 16, and post-processing is not necessary after cutting out the protruding silicone rubber 25.
[0026]
【The invention's effect】
According to the present invention, the stator, the circuit board including the electronic components, and the plurality of lead wires are integrally molded by one injection of silicone rubber while being accommodated in the stator side case. The molding work with silicone rubber becomes one time, and the work man-hour can be reduced. Further, the mold layer made of silicone rubber has an advantage that the waterproof effect is high because there is no interface between the two mold parts.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an essential part showing a first example of an embodiment of a brushless fan motor according to the present invention.
FIG. 2 is a longitudinal sectional view of an essential part showing a second example of an embodiment of a brushless fan motor according to the present invention.
FIG. 3 is a longitudinal sectional view showing a state of one step of a method of manufacturing a brushless fan motor according to the present invention.
4 is a front view showing a mounting state of the mold type as viewed from the right side in FIG. 3. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Stator 2 Iron core 2a Salient pole part 2a 'Magnetic pole surface 3 Winding 4 Circuit board 4a Through hole 4b Solder 4c Terminal pin 5 Rotor 6 Rotor magnetic pole 7 Blade 8 Stator side case 9 Rotating shaft 10 Bearing 11 Bearing support Tube portion 11a End portion 12 Housing portion 13 Substrate storage portion 13a Opening side end portion 14 Web 15 Lead wire 15 'Protective tube 16 Lead wire storage groove 17 Communication path 18 Rotor side case 18a Opening side end portion 19 Bush 20 Fly Wheel 20a Yoke portion 20b Bottom plate portion 21 Blade mounting hub 22 Adhesives 23, 24 Gap 25 Silicone rubber 26 Mold space 27 First mold die 28 Air vent 29 Second mold die 30 Silicone rubber inlet

Claims (1)

A stator having a plurality of stator magnetic poles in which a winding is wound around the salient pole part of an iron core having a plurality of salient pole parts;
A circuit board on which an electronic component constituting a control circuit for controlling a current flowing in the winding constituting the plurality of stator magnetic poles of the stator and fixed to the stator is mounted;
A rotor having a plurality of rotor magnetic poles made of permanent magnets on the inner peripheral side and a plurality of blades on the outer peripheral side;
A bearing support cylinder portion in which a bearing that rotatably supports the rotating shaft of the rotor is housed, a housing portion that surrounds the outer periphery of the blade of the rotor, and a substrate housing in which the circuit board is housed and fixed. And a stator side case comprising a plurality of webs for connecting the substrate housing part and the housing part,
One of the webs is formed with a lead storage groove for storing a plurality of lead wires extending from the control circuit of the circuit board and guiding them to the housing side,
A communication path is formed between the lead wire storage groove and the substrate storage portion to communicate the two.
A brushless fan motor in which the stator, the circuit board including the electronic components, and the lead wires housed in the lead wire housing groove are molded with silicone rubber;
The stator, the circuit board including the electronic components, and the plurality of lead wires are integrally molded by one injection of silicone rubber while being accommodated in the stator side case ,
The magnetic pole surface of the stator magnetic pole of the stator is also covered with the silicone rubber ,
The rotor is fixed to the rotating shaft in order to fix the rotor side case to the rotating shaft and the rotor side case in which the blade is arranged on the outer peripheral side and the rotor magnetic pole is arranged on the inner peripheral side. With a bush,
The opening side end of the rotor side case and the opening side end of the substrate housing part of the stator side case are opposed to each other with a slight gap to prevent water from entering inside. Is configured to form a labyrinth structure,
In addition, the brushless fan motor is configured such that the end of the bearing supporting cylinder and the bush form a labyrinth structure in which both face each other through a slight gap and prevent water from entering inside. .

Images